In solution the reaction enthalpy for the thermal isomerization of the Dewar isomers 2a and 2b to their corresponding 8,9-disubstituted [6]paracyclophanes 1a and 1b was determined as −128±13 kJ·mol−1 and −146±15 kJ·mol−1, while the activation energies were found to be 101±10 kJ·mol−1 and 117±12 kJ·mol−1 respectively. An improved calorimetric technique was employed using samples in sealed NMR tubes
在溶液中,将杜瓦异构体2a和2b热异构化为相应的8,9-二取代的[6]对环环
酮1a和1b的反应焓确定为-128±13 kJ·mol -1和-146±15 kJ· mol -1,而活化能分别为101±10 kJ·mol -1和117±12 kJ·mol -1。在密封的NMR管中使用样品采用了改进的量热技术。